CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUE
Rental income	$ 167,035	$ 213,558	$ 241,017
Management and other fee income	$ 1,598	$ 1,196
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenue	$ 168,633	$ 214,754	$ 241,017
EXPENSES
Property operating	42,123	28,705	19,700
Real estate taxes	38,595	42,446	45,653
Depreciation and amortization	104,581	226,675	262,171
General and administrative	39,156	34,788	27,902
Provision for doubtful accounts		257	158
Total expenses	224,455	332,871	355,584
Gain on sale of real estate	71,104	96,165	11,447
Gain on sale of interests in unconsolidated joint ventures	6,721		60,302
Equity in loss of unconsolidated joint ventures	(17,994)	(10,448)	(7,788)
Interest and other income	6,824	7,886	877
Interest expense	(94,519)	(90,020)	(70,112)
Change in fair value of interest rate cap		(23)	(701)
Loss before income taxes	(90,407)	(114,557)	(120,542)
Provision for income taxes	(196)	(321)	(271)
Net loss	(90,603)	(114,878)	(120,813)
Net loss attributable to non-controlling interests	31,206	41,406	47,059
Net loss attributable to Seritage	(59,397)	(73,472)	(73,754)
Preferred dividends	(4,900)	(4,903)	(245)
Net loss attributable to Seritage common shareholders	$ (64,297)	$ (78,375)	$ (73,999)
Net loss per share attributable to Seritage Class A and Class C common shareholders - Basic	$ (1.77)	$ (2.20)	$ (2.19)
Net loss per share attributable to Seritage Class A and Class C common shareholders - Diluted	$ (1.77)	$ (2.20)	$ (2.19)
Weighted average Class A and Class C common shares outstanding - Basic	36,413	35,560	33,804
Weighted average Class A and Class C common shares outstanding - Diluted	36,413	35,560	33,804